Custom Power Apps for Business: Cost, Process and Timeline

A custom Power Apps application is a business app built to fit one of your processes, on top of data held in Dataverse or your existing systems. Basic solutions can be delivered in 2–4 weeks and more complex projects typically take 2–3 months. The cost depends mainly on the data model, the number of integrations, security requirements and how much of the app can be built with standard components.

1. What a custom Power Apps application is

Power Apps is Microsoft's low-code platform for business applications. Instead of buying a ready-made product and bending your process around it, you describe the process once and build an app that follows it: a form for requests, a tool for field inspections, a case-handling screen for the back office. The app runs in the browser, on a phone or inside Microsoft Teams, and signs users in with their company Microsoft account.

"Custom" does not mean "built from scratch in code". Most of the app is assembled from platform components, which is exactly why delivery is faster than traditional development. Custom work goes where it matters: the data model, the business rules, the security and the user experience for the people who will use the app every day.

2. Types of Power Apps and when to use each

Many solutions combine two types on the same data: a canvas app for people in the field and a model-driven app for the back office. Both read and write the same Dataverse tables, so there is one source of truth.

3. Power Apps or custom code?

The honest answer is that neither is better in general. Power Apps wins when the app is mostly forms, data, approvals and integrations with Microsoft 365, because those parts are ready and already secured. Custom code wins when the user interface is the product or when the performance requirements go beyond what the platform is built for.

There is also a middle path. When standard controls reach their limit, PCF components and Code Apps add custom parts, and Azure Functions or custom connectors reach systems the platform does not know. You keep the platform's security, DLP and governance and still get the freedom of code where you need it.

4. What drives the cost

We do not quote a price before we understand the scope, because the same-looking app can be very different underneath. These are the drivers that move the budget the most:

• Data model. The number of tables, relationships and rules. It is the part that is most expensive to change later, so it is designed first.
• Integrations. Every connected system (ERP, document store, e-mail, a legacy database) adds design, testing and ongoing maintenance.
• Security and compliance. Role models, row-level and column-level security, audit needs and GDPR requirements.
• User experience. A simple form is cheap; a polished mobile interface for hundreds of field workers is not.
• Number of user roles and screens. More roles mean more views, permissions and testing.
• Licensing. Microsoft licences for users or apps, and premium connectors, are a running cost separate from development.
• Environments and release. Development, test and production with automated pipelines cost more upfront and save a lot later.
• Migration. Moving data from spreadsheets, SharePoint lists or old InfoPath forms.

A useful way to think about it: the screens are the visible part, but most of the effort sits in data, security and integration. A first working version that covers one process end to end is usually the best way to turn an estimate into a fixed scope.

5. How a Power Apps project runs

1. Discovery and prioritisation. We map processes, users and data, then decide what to build, what to migrate and what to retire.
2. Data model first. Dataverse tables, relationships and security roles are designed before the first screen.
3. Build in short iterations. Users see a working app early and steer it with regular feedback.
4. Test and release through environments. Development, test and production with automated deployment.
5. Hand-over and support. Documentation, training for makers and administrators, and support under an agreed SLA if you want it.

6. How long it takes

These are typical ranges, not promises. The biggest factor in real schedules is rarely the build itself: it is how quickly decisions, test users and access to other systems become available.

7. Checklist before you start

• One process owner who can make decisions.
• A written description of how the process runs today, including exceptions.
• A list of the systems and data the app has to read or write.
• A list of user roles and what each role may see and change.
• A way to measure success, for example time spent today.
• Agreement on who will own and maintain the app after launch.
• Clarity on licences and the Microsoft 365 tenant the app will run in.

Common mistakes to avoid

• Starting with screens instead of data. A pretty prototype on a weak data model has to be rebuilt as soon as real requirements arrive.
• Treating the first release as the last. Business apps improve through use; plan a budget for the changes users will ask for in the first months.
• Skipping environments. Editing a live app that people depend on is how outages happen.
• Ignoring ownership. An app built by one enthusiast and owned by nobody becomes shadow IT as soon as that person moves on.
• Underestimating change management. Even a good app fails if the people who should use it were never consulted or trained.

Most of these cost far less to prevent at the start than to repair later, and none of them is a technology problem.

Frequently asked questions

How much does a custom Power Apps application cost?

It depends on the data model, the number of integrations, security requirements, the number of user roles and the licences you need. We describe the scope first and then give a fixed or capped estimate, rather than quoting a number before we understand the process.

How long does it take to build a Power Apps solution?

Basic solutions can be implemented in 2–4 weeks. More complex projects typically take 2–3 months. We work in short iterations, so you see a working app long before the final release.

Is Power Apps secure enough for sensitive data?

Yes, when it is designed for it. Apps run on Microsoft's cloud infrastructure and we add Dataverse security roles, row-level and column-level security, DLP policies and controlled environments. The City of Bratislava solution is 100% security compliant.

Can Power Apps connect to our existing systems?

Yes. The platform has 1,500+ connectors, and where one is missing we build a custom connector or an Azure Function in front of the system.

What happens if the app outgrows low-code?

You do not have to start over. PCF components and Code Apps add custom code inside the same platform, and the data stays in Dataverse.

Who maintains the app after launch?

Either your own team after training, or us under an agreed SLA. We document the solution and train makers and administrators during hand-over.